1. Restricted stock units granted on February 25, 2020 under the Registrant's 2018 Equity and Incentive Plan (Plan). The units vest in four equal installments on each of the first four anniversaries of February 27, 2020, subject to the reporting person's continued employment. The reporting person will receive one share of common stock for each vested restricted stock unit.

2. Includes restricted stock units previously reported.

3. Shares of common stock as previously reported.

4. Stock options granted on February 25, 2020 under the Plan. The options vest in four equal installments on each of the first four anniversaries of February 27, 2020, subject to the reporting person's continued employment.

/s/ Paul F. Cash as Attorney-in-Fact for Scott R. Strickland

02/27/2020

** Signature of Reporting Person

Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person,
see
Instruction
4
(b)(v).